rule win_herpes_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.herpes."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.herpes"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { 03d0 3bd3 7621 83f910 720f 8b07 }
            // n = 6, score = 100
            //   03d0                 | add                 edx, eax
            //   3bd3                 | cmp                 edx, ebx
            //   7621                 | jbe                 0x23
            //   83f910               | cmp                 ecx, 0x10
            //   720f                 | jb                  0x11
            //   8b07                 | mov                 eax, dword ptr [edi]

        $sequence_1 = { e8???????? 8b0d???????? c70101000000 83c41c }
            // n = 4, score = 100
            //   e8????????           |                     
            //   8b0d????????         |                     
            //   c70101000000         | mov                 dword ptr [ecx], 1
            //   83c41c               | add                 esp, 0x1c

        $sequence_2 = { 5d c20400 83ff23 7512 68???????? e8???????? 83c404 }
            // n = 7, score = 100
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   83ff23               | cmp                 edi, 0x23
            //   7512                 | jne                 0x14
            //   68????????           |                     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_3 = { 7506 56 e9???????? 8bb588fdffff 90 8d8db8fdffff 68???????? }
            // n = 7, score = 100
            //   7506                 | jne                 8
            //   56                   | push                esi
            //   e9????????           |                     
            //   8bb588fdffff         | mov                 esi, dword ptr [ebp - 0x278]
            //   90                   | nop                 
            //   8d8db8fdffff         | lea                 ecx, [ebp - 0x248]
            //   68????????           |                     

        $sequence_4 = { bf???????? 833cf5d4c9410001 751d 8d04f5d0c94100 8938 68a00f0000 }
            // n = 6, score = 100
            //   bf????????           |                     
            //   833cf5d4c9410001     | cmp                 dword ptr [esi*8 + 0x41c9d4], 1
            //   751d                 | jne                 0x1f
            //   8d04f5d0c94100       | lea                 eax, [esi*8 + 0x41c9d0]
            //   8938                 | mov                 dword ptr [eax], edi
            //   68a00f0000           | push                0xfa0

        $sequence_5 = { 8bcf c60700 e8???????? 8b4dfc 33cd 8bc7 }
            // n = 6, score = 100
            //   8bcf                 | mov                 ecx, edi
            //   c60700               | mov                 byte ptr [edi], 0
            //   e8????????           |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   33cd                 | xor                 ecx, ebp
            //   8bc7                 | mov                 eax, edi

        $sequence_6 = { ff15???????? eb26 68???????? ebe7 }
            // n = 4, score = 100
            //   ff15????????         |                     
            //   eb26                 | jmp                 0x28
            //   68????????           |                     
            //   ebe7                 | jmp                 0xffffffe9

        $sequence_7 = { 895dfc e8???????? 837de810 8b45d4 7302 8bc6 }
            // n = 6, score = 100
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   e8????????           |                     
            //   837de810             | cmp                 dword ptr [ebp - 0x18], 0x10
            //   8b45d4               | mov                 eax, dword ptr [ebp - 0x2c]
            //   7302                 | jae                 4
            //   8bc6                 | mov                 eax, esi

        $sequence_8 = { e9???????? 8d7554 e9???????? 8b542408 8d420c 8b4acc 33c8 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   8d7554               | lea                 esi, [ebp + 0x54]
            //   e9????????           |                     
            //   8b542408             | mov                 edx, dword ptr [esp + 8]
            //   8d420c               | lea                 eax, [edx + 0xc]
            //   8b4acc               | mov                 ecx, dword ptr [edx - 0x34]
            //   33c8                 | xor                 ecx, eax

        $sequence_9 = { 3bf3 0f97c0 84c0 7439 8b4d9c b810000000 3945b0 }
            // n = 7, score = 100
            //   3bf3                 | cmp                 esi, ebx
            //   0f97c0               | seta                al
            //   84c0                 | test                al, al
            //   7439                 | je                  0x3b
            //   8b4d9c               | mov                 ecx, dword ptr [ebp - 0x64]
            //   b810000000           | mov                 eax, 0x10
            //   3945b0               | cmp                 dword ptr [ebp - 0x50], eax

    condition:
        7 of them and filesize < 319488
}